Selective hydration of nitriles to primary amides as well the base-catalyzed synthesis of 2-substituted 4(1H)-quinazolinones via reaction of 2-aminobenzonitrile with carbonyl compounds using macroporous Amberlyst A26 OH in H2O–EtOH is described. The latter reaction proceeds via tandem hydration of 2-aminobenzonitrile, condensation of the in situ generated 2-aminobenzamide with carbonyl compounds, and cyclization of the imine intermediate to give the quinazolinone derivatives.
Key words
hydration - nitriles - amides - quinazolinones - Amberlyst A26 OH - recyclable catalyst